Episode 14 was announced a while back:
Can’t link the article directly, but it’s the one posted August 28, announcing a 未放送 (unaired) episode to be included in DVD/BD 7.
vol.7 : 2015年3月18日発売
We weren’t sure if THAT was supposed to be episode 13 (as in, 12 eps aired, and this mysterious 13 would be the unaired OVA) or if it would be a 14th episode, but all DVD/BDs are the same price, and so far all have 2 episodes on them. 7 DVDs with 2 episodes each = 14 episodes, and we also know that episode 13 is coming next week. So 14 episodes total!
As for the movie, it’s nothing more than predictions. The unaired episode would be a good lead-in to it, though, and it’s being released at the same time as the mysterious seiyuu event—plus Kyoani has done movies of their series before (most recently, Tamako Love Story).
If there’s a movie coming, it’ll either be announced at the end of next week’s episode (probably on the endcard) OR at the seiyuu event next March :3 (I’d go with announced on the endcard, and the seiyuu event would be used to hype it, with a release next summer).
It’s all completely hypothetical though :) Nothing set in stone yet.